Grassy Flats Resort & Beach Club

Tropical Modern Design, Washed by the Middle Keys

The stretch of the Overseas Highway through Marathon is not known for design hotels — it is known for fishing charters, bait shops and roadside motels with decades-old signage. Grassy Flats breaks that pattern on purpose: a tropical-modern resort built oceanfront with sustainable materials and native landscaping, named for the shallow grass flats its waters open onto. It reads as a genuine design project rather than a renovated motel, which in the middle Keys is rarer than the ocean view itself.

Why It Works

We chose Grassy Flats because it solves a real gap in the middle Keys: a resort with real design intent that still keeps the barefoot, loose-limbed feel the Keys are known for. The saltwater pool splits into adults-only and family zones, so neither crowd has to compromise, and a floating Aqua Cabana just offshore gives the property a genuine signature feature most Marathon hotels can't match. Kayaks and paddleboards are included for exploring the flats directly, rather than treated as a paid add-on.

Why This Location

Marathon sits roughly in the middle of the Florida Keys, about an hour south of Key Largo and ninety minutes north of Key West — close enough to day-trip either direction, far enough to avoid both crowds. Grassy Flats sits directly on the water with beach access on site, and Marathon's airport, fishing charters and Sombrero Beach are all a short drive. It is a base for guests who want the Keys' open water and flats fishing culture without committing to a full Key West stay.

Fast Facts

• Prix: €€€ (Premium)

• Vibe: tropical-modern, eco-conscious, barefoot

• Chambres: seven room types, king or queen beds, four adults-only and three multi-bedroom family suites

• Best For: couples wanting a design-forward Keys stay, families needing more space, anglers and paddlers

• Our Favorite Thing About the Hotel: the floating Aqua Cabana anchored just offshore

• Dining: Rhum House restaurant and the rooftop Palm Deck bar, with regular live music

• Amenities: direct beach access, saltwater pool with adults-only and family sections, hot tub, kayaks and paddleboards, pet-friendly

• Attractions: Sombrero Beach nearby; Marathon's fishing charters and flats on the doorstep; Key West about 90 minutes south

Two Pools, One Resort

Splitting the saltwater pool into adults-only and family areas is a small design choice with an outsized effect: couples get a quiet deck, families get a water park atmosphere with play equipment, and neither group competes for the same loungers. Rooms keep to a tropical-modern palette with balconies and ocean views on the premium categories, while the three multi-bedroom family suites give groups genuine separate space rather than a connecting door between two standard rooms. Native landscaping and eco-conscious building choices run through the grounds rather than sitting in a sustainability brochure, which fits a resort built on flats that depend on exactly that kind of care.

Rhum House and the Rooftop

Rhum House anchors the resort's dining, while the Palm Deck rooftop bar turns sunset into a scheduled event most evenings with live music over the water. Between the two venues and the poolside bar, Grassy Flats gives guests a reason to stay on property after dark — unusual in a part of the Keys where dinner often means driving the highway in the dark to the next town.

Before You Book

Marathon is quieter and more spread out than Key West, so guests wanting dense nightlife and walkable bars should look south instead; this is a resort stay built around the water, the pools and the two on-site venues rather than a town to explore on foot. Pets are allowed for a fee, worth confirming at booking, and the adults-only pool section should be noted by families expecting full run of the property.